JSON Formatter & Validator

Formatted output will appear here…

{
  "status": "success",
  "data": {
    "user": {
      "id": 42,
      "name": "Alex Carter",
      "email": "alex@example.com",
      "role": "admin",
      "createdAt": "2024-01-15T10:30:00Z"
    },
    "pagination": {
      "page": 1,
      "perPage": 20,
      "total": 148
    }
  }
}

{
  "id": "evt_3NxK2L2eZvKYlo2C1FUjPqAs",
  "object": "event",
  "type": "payment_intent.succeeded",
  "created": 1693420800,
  "data": {
    "object": {
      "id": "pi_3NxK2L2eZvKYlo2C10FkMpD9",
      "amount": 4999,
      "currency": "usd",
      "status": "succeeded",
      "customer": "cus_OXvbMLkr7O7xM8"
    }
  }
}

{
  "id": 804398823,
  "name": "my-project",
  "full_name": "alex/my-project",
  "private": false,
  "owner": {
    "login": "alex",
    "id": 12345678,
    "type": "User"
  },
  "html_url": "https://github.com/alex/my-project",
  "stargazers_count": 412,
  "language": "TypeScript",
  "default_branch": "main"
}

{
  "name": "my-app",
  "version": "1.0.0",
  "description": "A modern web application",
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
    "test": "vitest"
  },
  "dependencies": {
    "react": "^18.2.0",
    "react-dom": "^18.2.0"
  },
  "devDependencies": {
    "typescript": "^5.0.0",
    "vite": "^4.4.0"
  }
}

{
  "Records": [
    {
      "eventVersion": "2.1",
      "eventSource": "aws:s3",
      "awsRegion": "us-east-1",
      "eventTime": "2024-03-15T12:00:00.000Z",
      "eventName": "ObjectCreated:Put",
      "s3": {
        "bucket": { "name": "my-uploads-bucket" },
        "object": {
          "key": "uploads/photo.png",
          "size": 1048576
        }
      }
    }
  ]
}

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [-122.4194, 37.7749]
      },
      "properties": {
        "name": "San Francisco",
        "population": 874961,
        "country": "US"
      }
    }
  ]
}

{
  "sub": "user_a8f3k21",
  "iss": "https://auth.example.com",
  "aud": "https://api.example.com",
  "iat": 1693420800,
  "exp": 1693507200,
  "email": "alex@example.com",
  "roles": ["user", "editor"],
  "scope": "read:data write:data"
}

{
  "openapi": "3.1.0",
  "info": { "title": "My API", "version": "1.0.0" },
  "paths": {
    "/users/{id}": {
      "get": {
        "summary": "Get user by ID",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "required": true,
            "schema": { "type": "integer" }
          }
        ],
        "responses": {
          "200": { "description": "User found" },
          "404": { "description": "User not found" }
        }
      }
    }
  }
}

Free JSON Formatter Online — Beautify & Validate JSON Instantly

Need to clean up messy JSON in seconds? Our free JSON Formatter & Validator instantly beautifies, formats, and validates your JSON the moment you paste it in. As a fast and reliable json formatter online, it turns minified or broken JSON into clean, properly indented, readable code — so you can stop squinting at one long line and start working.

But it does more than format. Validate your JSON in real time with clear error messages and line numbers that pinpoint exactly where something's wrong, minify it back down to save space, and explore large objects with a collapsible tree view. Whether you're debugging an API response, inspecting a config file, or cleaning data before a commit, everything you need is right here.

Simply paste your JSON and see formatted, validated results instantly. No sign-up, no downloads, no limits — just clean, correct JSON whenever you need it.

What This JSON Formatter Does

• Format & Beautify — converts minified one-liner JSON into clean, 2-space-indented, human-readable code
• Minify — strips all whitespace for compact output ready to transmit or store
• Validate with error lines — catches missing commas, unclosed brackets, trailing commas, mismatched quotes, and other syntax errors — with the exact line number
• Collapsible tree view — explore deeply nested structures by expanding and collapsing objects and arrays
• Syntax highlighting — keys, strings, numbers, booleans, and null are colour-coded for fast scanning
• Privacy-first — all processing happens in your browser; nothing is sent to a server

Format JSON from Any Source

This tool handles JSON from every common source. Use it as a JSON pretty printer to indent compact one-liners, a JSON linter to catch syntax errors before they hit production, or a JSON viewer to navigate large nested structures. Whatever the source, paste it in and get clean, readable output instantly — no setup, no sign-in.

• REST & GraphQL API responses — beautify raw payloads from Postman, curl, or browser DevTools
• Stripe, PayPal & payment webhooks — inspect event JSON when building or debugging integrations
• GitHub, GitLab & Bitbucket API — format repository, pull request, and webhook responses
• package.json & config files — clean up npm, Composer, or any JSON-based configuration file
• AWS, GCP & Azure events — view S3, SNS, Lambda, and other cloud event payloads
• GeoJSON & map data — inspect FeatureCollections, coordinates, and geographic properties
• JWT payloads — decode and explore claims from JSON Web Tokens
• OpenAPI & Swagger schemas — format and validate API specification JSON

Who Uses an Online JSON Formatter?

Backend developers paste API responses to validate and inspect payloads between services. Frontend engineers copy JSON from browser DevTools and beautify it to understand data structures. DevOps teams validate config files, pipeline definitions, and infrastructure-as-code manifests before deploying. Data engineers clean JSON exports before loading into databases or pipelines. Anyone who works with JSON regularly — from a 10-line config to a 10,000-line API response — benefits from a live json formatter online that works instantly with no setup.

Have questions about how it works or how your data is handled? Read the FAQ →